TDA7340G
AUDIO SIGNAL PROCESSOR
AUDIOPROCESSOR:
MUTE, SOFT MUTE AND ZERO CROSSING
MUTE
ONE DIFFERENTIAL, TWO STEREO AND
TWO MONO INPUTS
DIFFERENTIAL PHONE INPUT
VOLUME, BASS, TREBLE AND LOUDNESS
CONTROL
FOUR SPEAKER ATTENUATORS WITH IN-
DEPENDENT ATTENUATION CONTROL
STEREODECODER:
ROLL-OFF ADJUSTMENT
ADJUSTMENT FREE INTEGRATED 456KHz
VCO
HIGH CUT CONTROL
STEREO BLEND
NOISE BLANKER:
INTEGRATED HIGH-PASS FILTER
NOISE RECTIFIER OUTPUT FOR QUALITY
DETECTION
PROGRAMMABLE TRIGGER THRESHOLD
DEVIATION AND FIELD STRENGTH DE-
PENDENT TRIGGER ADJUSTMENT
PAUSE DETECTOR:
PROGRAMMABLE THRESHOLD
ALLFUNCTIONS PROGRAMMABLEVIA I
2
C BUS
DESCRIPTION
The TDA7340G I
2
C bus controlled audio signal
processor contains all signal processing blocks of
a high performance car radio, including audio-
processor, stereodecoder, noise blanker, pause
detector and different mute functions.
The use of BICMOS technology allows the imple-
mentation of several filter functions with switched
capacitor techniques like fully integrated, adjust-
ment free PLL Loop filter, pilot detector with inte-
grator and pilot cancellation.
This minimizes the number of external compo-
nents.
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
bipolar multipliers, very low distortion and very
low noise are obtained also in the stereodecoder
part. The audioprocessor contains several new
features like softmute, zero-crossing mute and
pause detector.
Very low DC stepping is obtained by use of a
BICMOS technology.
September 1999
ORDERING NUMBER: TDA7340G
PQFP44
1/27
AUDIO PROCESSOR PART
FEATURES:
Input Multiplexer:
DIFFERENTIAL CD STEREO INPUT
CASSETTE STEREO INPUT
FM STEREO INPUT FROM STEREODE-
CODER
AM INPUT:
MONO OR STEREO MODE (PROGRAMMA-
BLE)
BEEP INPUT (ONLY IN AM MONO MODE)
TELEPHONE DIFFERENTIAL MONO INPUT
GAIN PROGRAMMABLE IN
3 x 3.75dB
STEPS
Loudness:
FULLY PROGRAMMABLE
15 x 1.25dB STEPS
Volume Control:
1.25dB COARSE ATTENUATOR
0.31dB FINE ATTENUATORS
MAX GAIN 20dB
MAX ATTENUATION 59.7dB (PLUS LOUD-
NESS)
Bass Control
7 x 2dB STEPS
2nd ORDER SYMMETRICAL OR NON SYM-
METRICAL CUT FREQUENCY RESPONSE
Treble Control
7 x 2dB STEPS
Speaker Control
4 INDEPENDENT SPEAKER CONTROL IN
1.25dB STEPS
CONTROL RANGE 37.5dB
INDEPENDENT SPEAKER MUTE
Mute Functions
DIRECT MUTE
ZERO CROSSING MUTE WITH PROGRAM-
MABLE THRESHOLD
SOFT MUTE WITH EXTERNAL DEFINED
SLOPE
SOFT MUTE VIA I
2
C BUS OR EXTERNALLY
CONTROLLED
Pause Detector
PROGRAMMABLE THRESHOLD
DELAY TIME DEFINED BY AN EXTERNAL
CAPACITOR
STEREO DECODER PART
FEATURES:
INTERNALLY
ADJUSTABLE
ROLL-OFF
COMPENSATION (I
2
C BUS CONTROLLED)
INTEGRATED PILOT CANCELLATION
ON CHIP FILTER FOR PILOT DETECTOR
AND PLL
ADJUSTMENT FREE VOLTAGE CONTROL-
LED OSCILLATOR
AUTOMATIC
PILOT
DEPENDENT
MONO/STEREO SWITCHING
VERY HIGH INTERMODULATION AND IN-
TERFERENCE SUPPRESSION
I
2
C BUS CONTROLLED (STD OFF, FORCED
MONO, STEREO)
HIGH CUT CONTROL
STEREO BLEND
NOISE BLANKER PART
FEATURES:
INTERNAL 2nd ORDER HIGH-PASS FILTER
NOISE RECTIFIER OUTPUT FOR SIGNAL
QUALITY DETECTION
PROGRAMMABLE TRIGGER THRESHOLD
TRIGGER THRESHOLD DEPENDENT ON
HIGH FREQUENCY NOISE
BLANKING TIME PROGRAMMABLE BY EX-
TERNAL CAPACITOR
VERY LOW OFFSET CURRENT DURING
HOLD TIME DUE TO OPAMPS WITH MOS
INPUTS
LEVEL INPUT FOR ADDITIONAL SPIKE DE-
TECTION ON FIELD STRENGTH WITH IN-
TERNAL 1st ORDER + 20KHz HIGH PASS
FILTER
NOISE RECTIFIER OUTPUT FOR QUALITY
DETECTION
CIRCUITS FOR DEVIATION AND FIELD
STRENGTH DEPENDENT TRIGGER AD-
JUSTMENT
TDA7340G
2/27
SUPPLY
VOLUME
+
LOUDNESS
DEMODULATOR
AND
AMPLITUDE
ADJ
CREF
PAUSE
OUT
LR
D95AU329A
I
2
C
BUS
6x
1
F
PLL
456KHz
V
S
1nF
C13
47nF
C4
47nF
C15
TDA7340G
(AM
MONO)
AM_L
CASS
L
MUX
PHONE
GND
4x
4.7
F
CD
1
FC
2
1
F
C3
1
F
PAUSE
47nF
C5
MPX
MUTE
SOFT
MUTE
47nF
C6
BASS
6.2K
R1
6.2K
R2
4x
100nF
TREBLE
C11
2.7nF
2.7nF
C12
OUT
LR
OUT
LF
OUT
RR
OUT
RF
OUT
LF
OUT
RR
OUT
RF
SCL
SDA
DIGGND
80KHz
LP
FM
R
FM
L
HP
19KHz
CANCELLATION
25KHz
LP
NOISE
BLANKER
HIGH
CUT
CONTROL
PEAK
DETECTOR
PULSE
FORMER
LEVEL
CONTROL
LEVEL
PEAK
TBLANK
47nF
C16
470pF
C17
100K
R3
47K
R4
68K
47K
R6
VSB
VR
VHCC
reflevel
level
1nF
C14
field
strength
CD
L+
CD
R+
OUTR
OUTL
INR
INL
AM_R
(BEEP)
CASS
R
PHONE
IN
VCO
GND
C1
R5
HC
L
HC
R
LOUD
L
LOUD
R
CSM
BINL
BOUTL
BINR
BOUT
R
T
R
L
TR
R
C7
C8
C9
C10
(*)
(*)
NETWORK
TO
BE
ADAPTED
TO
THE
SPECIFIC
REQUESTS
FOR
STEREO
BLEND
AND
HIGH
CUT
CONTROL
+-
1.4V
HP
BLOCK DIAGRAM
TDA7340G
3/27
ELECTRICAL CHARACTERISTICS (V
S
= 9V; T
amb
= 25
C; R
L
= 10K
; all gains = 0dB; f = 1KHz;
C
REF
= 22
F; unless otherwise specified, refer to the Test Circuit.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY
V
S
Supply Voltage
6
9
10
V
I
S
Supply Current
Stereo Decoder = ON
10
20
25
mA
Stereo Decoder = OFF
5
12.5
20
mA
SVR
Ripple Rejection
Audioprocessor
70
90
dB
Stereo Decoder + Audioprocessor
55
dB
INPUT SECTION
R
I
Input Resistance
70
100
130
K
V
CL
Clipping Level
d
0.3%
2.1
2.6
Vrms
S
I
Input Separation
80
100
dB
R
L
Output Load Resistance
2
K
G
I MIN
Minimum Input Gain
-0.75
0
0.75
dB
G
I MAX
Max Input Gain
10.25
11.25
12.25
dB
G
STEP
Step Resolution
2.75
3.75
4.75
dB
e
IN
Input Noise
Single Ended Input
2.3
V
V
DC
Dc Steps
Adjacent Gain Step
2
10
mV
G
MIN
to G
MAX
3
mV
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
10.5
V
T
amb
Operating Temperature Range
-40 to 85
C
T
stg
Storage Temperature Range
-55 to 150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-pins
Thermal Resistance Junction-pins
max 85
C/W
1
2
3
5
6
4
7
8
9
10
17
11
18 19 20 21 22
44 43 42 41
39
40
38 37 36 35 34
28
27
26
24
23
25
33
32
31
29
30
GND
LOUD R
LOUD L
IN L
OUT L
CREF
SDA
SCL
CSM
DIGGND
VDD
PAUSE
VCO
PEAK
TBLANK
HCR
LEVEL
HCL
VSB
VR
VHCC
MPX
IN
R
OUT
R
BIN
R
BOUT
R
BOUT
L
BIN
L
AM_L
(BEEP)
AM_R
(AM
MONO)
CASS
L
CASS
R
TR
R
PHON IN
PHON GND
OUT LF
OUT LR
OUT RR
OUT RF
TR L
CD L+
CD L-
CD R+
CD R-
D94AU055A
12 13 14 15 16
TDA7340P
(PQFP44)
PIN CONNECTION
TDA7340G
4/27
ELECTRICAL CHARACTERISTICS (continued.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DIFFERENTIAL CD STEREO INPUT
R
I
Input Resistance
Input selector BIT D6 = 0 (0dB)
10
15
20
K
Input selector BIT D6 = 1(-6dB)
14
20
30
K
CMRR
Common Mode Rejection Ratio
V
CM
= 1V
RMS
;
f = 1KHz
f = 10KHz
48
75
dB
45
70
dB
d
Distortion
V
I
= 1V
RMS
0.01
0.08
%
e
IN
Input Noise
20Hz to 20KHz; Flat; D6 = 0
5
V
G
DIFF
Differential Gain
D6 = 0
-1
0
1
dB
D6 = 1
-7
-6
-5
dB
DIFFERENTIAL TELEPHONE MONO INPUT
R
I
Input Resistance
14
20
26
K
CMRR
Common Mode Rejection Ratio
V
CM
= 1V
RMS
; f = 1KHz
45
60
dB
d
Distortion
V
I
= 1V
RMS
0.15
0.5
%
e
IN
Input Noise
20Hz to 3 KHz; Flat
10
V
G
DIFF
Differential Gain
-4.75
-3.75
-2.75
dB
VOLUME CONTROL
R
I
Input Resistance (INR, INL)
24
35
46
K
C
MAX
Max Gain
18.75
20
21.25
dB
A
MAX
Max Attenuation
57.7
59.7
62.7
dB
A
STEPC
Step Resolution Coarse
Attenuation
0.50
1.25
2.00
dB
A
STEPF
Step Resolution Fine
Attenuation
0.11
0.31
0.51
dB
E
A
Attenuation Set Error
G = -20 to 20dB
-1.25
0
1.25
dB
G = -20 to -59.7dB
3
2
dB
E
T
Tracking Error
2
dB
V
DC
DC Steps
Adjacent Attenuation Steps
-3
0.1
3
mV
from 0dB to A
MAX
0.5
5
mV
LOUDNESS CONTROL (LOUDL, LOUDR)
R
I
Internal Resistance
35
50
65
K
A
STEP
Step Resolution
0.5
1.25
2.0
dB
A
MAX
Max Attenuation
17.5
18.75
20.0
dB
ZERO CROSSING MUTE
V
TH
Zero Crossing Threshold (1)
WIN = 11
20
mV
WIN = 10
40
mV
WIN = 01
80
mV
WIN = 00
160
mV
A
MUTE
Mute Attenuation
80
100
dB
V
DC
DC Step
0dB to Mute
0.3
3
mV
SOFT MUTE
A
MUTE
Mute Attenuation
45
60
dB
t
D
Delay Time
C
EXT
= 22nF;
I = I
MAX
0 to -20dB;
I = I
MIN
0.8
1.5
2.0
ms
15
25
45
ms
SOFT MUTE AT PHONE-GND
V
il
Input Low Voltage
1.4
1.6
V
(1) WIN represents the MUTE programming bit pair D6,D5 for the zero crossing window threshold
TDA7340G
5/27
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